The bird should not be released back into the wild until it has fully recovered from its injuries. UNTIL ...
Until fully recovered from its injuries, the bird should not be released into the wild.
On the day of the tree-planting event, don't bring any equipment unless you're informed otherwise. UNLESS...
Unless informed otherwise / otherwise informed, don't bring any equipment on the day of the tree-planting event.
Since the nature reserve opened last spring, it has received tens of thousands of visitors. SINCE ...
Since (its) opening last spring, the nature reserve has received tens of thousands of visitors.
After she travelled around South America, Paual wrote a book about her many experiences. AFTER...
After travelling around South America, Paula wrote a book about her many experiences.